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<div class="titlepage"><div><div><h4 class="title">
<a name="beast.ref.boost__beast__bind_handler"></a><a class="link" href="boost__beast__bind_handler.html" title="bind_handler">bind_handler</a>
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<p>
        <a class="indexterm" name="idm73780"></a>
      </p>
<p>
        Bind parameters to a completion handler, creating a new handler.
      </p>
<h5>
<a name="beast.ref.boost__beast__bind_handler.h0"></a>
        <span class="phrase"><a name="beast.ref.boost__beast__bind_handler.synopsis"></a></span><a class="link" href="boost__beast__bind_handler.html#beast.ref.boost__beast__bind_handler.synopsis">Synopsis</a>
      </h5>
<p>
        Defined in header <code class="literal">&lt;<a href="../../../../../../boost/beast/core/bind_handler.hpp" target="_top">boost/beast/core/bind_handler.hpp</a>&gt;</code>
      </p>
<pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span>
    <span class="keyword">class</span> <a href="../../../../../../doc/html/boost_asio/reference/Handler.html" target="_top"><span class="emphasis"><em>Handler</em></span></a><span class="special">,</span>
    <span class="keyword">class</span><span class="special">...</span> <span class="identifier">Args</span><span class="special">&gt;</span>
<span class="emphasis"><em>implementation-defined</em></span>
<span class="identifier">bind_handler</span><span class="special">(</span>
    <span class="identifier">Handler</span><span class="special">&amp;&amp;</span> <span class="identifier">handler</span><span class="special">,</span>
    <span class="identifier">Args</span><span class="special">&amp;&amp;...</span> <span class="identifier">args</span><span class="special">);</span>
</pre>
<h5>
<a name="beast.ref.boost__beast__bind_handler.h1"></a>
        <span class="phrase"><a name="beast.ref.boost__beast__bind_handler.description"></a></span><a class="link" href="boost__beast__bind_handler.html#beast.ref.boost__beast__bind_handler.description">Description</a>
      </h5>
<p>
        This function creates a new handler which, when invoked, calls the original
        handler with the list of bound arguments. Any parameters passed in the invocation
        will be substituted for placeholders present in the list of bound arguments.
        Parameters which are not matched to placeholders are silently discarded.
        The passed handler and arguments are forwarded into the returned handler,
        whose associated allocator and associated executor will will be the same
        as those of the original handler.
      </p>
<h5>
<a name="beast.ref.boost__beast__bind_handler.h2"></a>
        <span class="phrase"><a name="beast.ref.boost__beast__bind_handler.example"></a></span><a class="link" href="boost__beast__bind_handler.html#beast.ref.boost__beast__bind_handler.example">Example</a>
      </h5>
<p>
        This function posts the invocation of the specified completion handler with
        bound arguments:
      </p>
<pre class="programlisting"><span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">class</span> <span class="identifier">AsyncReadStream</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">ReadHandler</span><span class="special">&gt;</span>
<span class="keyword">void</span>
<span class="identifier">signal_aborted</span> <span class="special">(</span><span class="identifier">AsyncReadStream</span><span class="special">&amp;</span> <span class="identifier">stream</span><span class="special">,</span> <span class="identifier">ReadHandler</span><span class="special">&amp;&amp;</span> <span class="identifier">handler</span><span class="special">)</span>
<span class="special">{</span>
    <span class="identifier">net</span><span class="special">::</span><span class="identifier">post</span><span class="special">(</span>
        <span class="identifier">stream</span><span class="special">.</span><span class="identifier">get_executor</span><span class="special">(),</span>
        <span class="identifier">bind_handler</span> <span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">forward</span> <span class="special">&lt;</span><span class="identifier">ReadHandler</span><span class="special">&gt;</span> <span class="special">(</span><span class="identifier">handler</span><span class="special">),</span>
            <span class="identifier">net</span><span class="special">::</span><span class="identifier">error</span><span class="special">::</span><span class="identifier">operation_aborted</span><span class="special">,</span> <span class="number">0</span><span class="special">));</span>
<span class="special">}</span>
</pre>
<h5>
<a name="beast.ref.boost__beast__bind_handler.h3"></a>
        <span class="phrase"><a name="beast.ref.boost__beast__bind_handler.parameters"></a></span><a class="link" href="boost__beast__bind_handler.html#beast.ref.boost__beast__bind_handler.parameters">Parameters</a>
      </h5>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
                <p>
                  Name
                </p>
              </th>
<th>
                <p>
                  Description
                </p>
              </th>
</tr></thead>
<tbody>
<tr>
<td>
                <p>
                  <code class="computeroutput"><span class="identifier">handler</span></code>
                </p>
              </td>
<td>
                <p>
                  The handler to wrap. The implementation takes ownership of the
                  handler by performing a decay-copy.
                </p>
              </td>
</tr>
<tr>
<td>
                <p>
                  <code class="computeroutput"><span class="identifier">args</span></code>
                </p>
              </td>
<td>
                <p>
                  A list of arguments to bind to the handler. The arguments are forwarded
                  into the returned object. These arguments may include placeholders,
                  which will operate in a fashion identical to a call to <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">bind</span></code>.
                </p>
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<td align="right"><div class="copyright-footer">Copyright © 2016-2019 Vinnie
      Falco<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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